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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to optimize integer vector conversion to float vector properly when integer vector is larger"
href="https://bugs.llvm.org/show_bug.cgi?id=52055">52055</a>
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<th>Summary</th>
<td>Failure to optimize integer vector conversion to float vector properly when integer vector is larger
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>gabravier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>typedef int v8si __attribute__((vector_size(32)));
typedef float v4sf __attribute__((vector_size(16)));
void low (v4sf *dst, v8si *srcp)
{
v8si src = *srcp;
*dst = (v4sf) { (float)src[0], (float)src[1], (float)src[2], (float)src[3] };
}
This can be optimized equivalently to replacing the first statement with `auto
src = *(int __attribute__((vector_size(16)))*)srcp;` (non-withstanding
aliasing). This optimization is done by GCC, but not by LLVM.</pre>
</div>
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